What is WPS PQR WPQ and ASME Section IX Overview

What is Mean By WPS/PQR/WPQ

Welding Procedure Specification (WPS) : Welding Procedure Specification is written procedure prepare to Provide direction for Making Sound Production Weld as per Code Requirements.

WPS Consist of Welding Variables Such as Essential Welding Variable, Supplementary Variables and Non Essential variables.

  1. Essential Welding Variables : This Variables are related to Mechanical Properties of Weld Joints. Any Changes in this variables affect Mechanical properties of Weld Joints so if you want to change any variables it needs to re-qualify Welding Procedure Specification (WPS)
  2. Supplementary Variables : This Variables are related to Toughness Properties of Weld Properties of Weld Joints. Any Changes in this variables affect Toughness properties of Weld Joints so if you want to change any variables it needs to re-qualify Welding Procedure Specification (WPS). But this variables are applicable only if material required toughness properties.
  3. Non Essential Variables : This Variables Does not affect any Mechanical Properties So any Changes in this variables does not required to re-qualify Welding Procedure Specification.

Procedure Qualification Record (PQR) : Procedure Qualification Record is a compiled document of Recorded Values of All Variables during Welding and It also includes Test Result of Tested Specimen or Weld Coupon welded by Welder.

PQR Consist of Real time values of welding variables and test result documents of weld coupon. All PQR data should be recorded during welding process in witness of Inspection Authority of this Procedure Qualification.

Welder Performance Qualification (WPQ) : Welder Performance Qualification is written Document that Certify that welder or Welding Operator is capable of Producing Sound weld joints as per code requirements.

WPQ Consist of all variables related to welder performance and range of qualified values of Welder Performance. this Performance Qualification Test should also conducted with witness of Inspection Authority of Performance Qualification.

This is documents proves the ability of Welder or Welding Operator as per job requirement.

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wps pqr wpq

Overview of ASME Section IX Code

ASME Section IX Code : It is reference code of Welding, Brazing and Fusing Qualification.

ASME Section IX Code is four Sub Parts :

  1. Part QG – General Requirement of Welding, Brazing and Fusing.
  2. Part QW – Welding
  3. Prat QB – Brazing
  4. Part QF – Fusing

Part QG – General Requirement for Welding, Brazing and Fusing

  1. Procedure Specification (QG-101)
  2. Procedure Qualification Record (QG-102)
  3. Performance Qualification (QG-103)
  4. Performance Qualification Record (QG-104)
  5. Variables (QG-105)
  6. Organisational Responsibility (QG-106)
  7. Ownership Tranfer (QG-107)
  8. Qualification Made to Previous Editions (QG-108)
  9. Defintions (QG-109)

Part QW – Welding

  1. Article I – Welding General Requirements.
  2. Article II – Welding Procedure Qualification.
  3. Article III – Welding Performance Qualification
  4. Article IV – Welding Data
  5. Article V – Standard Procedure Specification.

This is overview of ASME Section IX on the point of Welding aspect as this Post is only Related to WPS PQR WPQ so we had considered only part related to Welding Qualifications.

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Imran Pinjara

Author of Book " Master in Fabrication Layout Development " Published worldwide. Founder and CEO of Let'sFab Educational Services. More than 8 Years of Professional Experience in Field of Pressure Vessel, Heat Ex changer, Storage Tanks, Piping and other Process Equipment Fabrication Industry. He had worked in many Fabrication Industry from small workshop to MNC Company. He had Completed PGDM in Process Piping Design and Engineering as per ASME B31.3 and Bachelor of Mechanical Engineering.

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